Snap-switch base.



flaw (WKW.

W. H. PRATT.

SNAP SWITCH BASE.

APPLICATION man ocnza. 19x4.

Patented Apr. 13, 11915 section of the only.

ill

WILLIS H. PRATT, 01E HARTFORD, CDNNEGTIGUIEP, AQSIGNOR TO THE ELECTRIC courses, or eau'rrorui, comcsorrour, a cosrouhrrou or oouuso'rrcur.

SNAP- EVJITCH BASE.

Application filed octoher 28, 2.914.

To all whom it may concern Be it known that I, WILLIS H. PRATT, a citizen of the United States residing at Hartford, in the county of Hartford. and

State of Connecticut. have invented a new and useful Improvement in Snap-@witch Bases, of which. the following is a. specificatiori.

This invention relates to the construction to of the bases of rotary snap electric switches and the means for supporting the operating mechanism. The oases of these switches are usually tormeti of circular blocks of porcelain with recesses in the upper --:t"ace for receiviug the locking, latching auol releasing mechanism. In orcler to have the supporting parts and the locks fit the base so as to properly support" the. actuating mechanisms h as been chnsitlererl necessary to make the to buses quite accurate and this is somewhat (iifticult in View of the friahility or brittle mess of the material azrrl the change it is likely to unclergorlurmg the process of I manufacture.

The object of this invention is to provide a construction which renders it unnecessary to use extreme caution in manufacture, and which produces bases that are strong and not liable to become damaged or broken in 0 use, and in w ich the locks and supporting aucl spindle support. Fig. 8 shows a bottom View of the base. l; shows a central section of the base and the locl and spindle :ipport oh the plane indicated by the dotted line he on Fig. 1. Fig. 5 shows a central The circular base 1 is made in the usual way of porcelain with a recess 2 in the upper surface and an opening 3 of considerable size through the middle. In the bottom 59 of the recess are four depressions 4: arranged approxu'nately tangential With relation to the central opening. lin the underside of the base is a recess 5 and 1n the face of time around the central .openlng through the base is an annular depression 6.

Specification of Letters Eateut.

above.

Peter Serial lto. 869,931.

'llhe lock plate i has four outwardly e1:- temlmg arms with upturned iuggs at extreme ends. Tins loch plate is s t into the recess in the top with its arms lyu in the tangential depressions in the bottom of the.

recess so that the top of the plate is approximately ilush with the surface of the recess, the lugs only projecting upward A11 opening is made through the center of the lock plate and aroiuui this opening the plate is depressed for receiving the angular'heacl 9 of the spindle support-- ing hub 10 that extends clown through the lock plate. On the underside of the base is a reentra'rot Washer 11,.theeclge of which lies in the depression 6, while the upwardly extending hotly portion enters the hole through the block; The supporting," huh er:- tenrls through this Washer and oil the threaded end of the hub outside of the Washer is a out 12. When this llllli is screwed up the loclr plate surl Washer ar tightly clampetl in place between the head of the hub and the nut.

With this'constructioh the lock plate is securely-held in position and. it cannot he turned under the blows which. it receives from the operating, mechanism of the switch when snapped. The securing nut o the end of the hub is locaterl in the reeutraut Washer, leaving space below tor such other parts of the switch as are necessary. The opening through the-ihase with this construction can be made; quite iargre so as to save porcelain and. lighten the structure.

and this large opening; permits oi?- the easy assembling and fastening; oi the, ports.

thermore, the Walls of the opening throu h the base do not have to her-readout thickness and in fact. can be quite ti so as to afiorci ample strength the strong and secure fastening ot'lthe parts.

The invention claimetl log 1. A snap switch base having a. recess in its upper face and a. central opening, with depressions in the bottom of the recess ex tending tangentially with relation to the central opening, a lock plate with outwardly extending arms and lip-turned lugs located in the recess With the arms lying in the semi depressions, a Washer arranged on the un- (lersicle of the base a hub extending through the lock plate and the Washer and having an angular head lying in a correspoudingz ly shaped depression in the lock plate, and a nut screwed on the hub, against the underside of the washer.

2. A snap switch base having a recess in its upper face and a central opening, with depressions in the bottom of the recess extending outwardly from said opening, a lock plate with outwardly extending arms and up-turned ends in'the recess with the arms lying in said elepressions, a reentrant washer on the underside of the base, a hub extending through the lo'ck plate and washer, said hub having an angular head lying in a correspondin'gly shaped depression in the lock plate, and anutf screwed on the end of the depression around said opening, a reentrant washer with its edge occupying the depression in the underside of the base and its body extending into the central opening, a hub extending through the lock. plate and the washer and having an angular head occupying the angular depression in the lock plate, and a nut turned on the threaded end of the hub and bearing against the underside of the washer in thereiintrant portion.

4, A snap switch base haying'a recess in its upper face, a recess in its lower face and a central opening, a lock plate havin outwardly extending arms with upturned ends located in the recess in the upper face of the base, said lock plate having a central opening, a reentrant washer located in the recess in the lower face of the base and having its reiintrant portion extending into the central opening, a hub extending through the lock plate and the washer, and a nut turned on the threaded end of the hub and bearing against the underside of the washer in the reentrant portion. a

' WILLIS H. PRATT. Witnesses:

S. VICTOR Bacon,

" Gnonon A. GAUTHIER. 

